RU57360U1 - Device for acoustic research of wells - Google Patents

Device for acoustic research of wells Download PDF

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Publication number
RU57360U1
RU57360U1 RU2006124605/22U RU2006124605U RU57360U1 RU 57360 U1 RU57360 U1 RU 57360U1 RU 2006124605/22 U RU2006124605/22 U RU 2006124605/22U RU 2006124605 U RU2006124605 U RU 2006124605U RU 57360 U1 RU57360 U1 RU 57360U1
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RU
Russia
Prior art keywords
acoustic
microcontroller
receivers
modem
digital
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RU2006124605/22U
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Russian (ru)
Inventor
Анатолий Сергеевич Моисеенко
Валентин Вадимович Стрельченко
Леонид Ивеенович Орлов
Сергей Анатольевич Муравьев
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Российский государственный университет нефти и газа им. И.М. Губкина
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Priority to RU2006124605/22U priority Critical patent/RU57360U1/en
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Publication of RU57360U1 publication Critical patent/RU57360U1/en

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Abstract

Usage: in the field of geophysical research of wells by the method of acoustic logging with the aim of lithological separation of the section, determining the physico-mechanical and petrophysical properties of rocks, as well as the degree of their anisotropy, fracturing and cavernousness. The essence of the proposal: a borehole device for acoustic research of wells, consists of a ground part, including a microcontroller with a modem, and connected to it through a communication channel of the bore part, containing the first and second channels for generating a sounding signal, consisting respectively of a series-connected digital-to-analog converter , a power amplifier and a narrowly directed emitter of acoustic waves, and from a series-connected pulse generator of short duration, a power amplifier and radiation an acoustic wave generator with a wide radiation pattern, at least two orthogonal pairs of acoustic signal receivers with amplifiers, a rotation drive of these receivers, a gyroscope, a multi-channel analog-to-digital converter, a microcontroller, a modem and a power supply unit with a power bus, the outputs of the gyroscope and amplifiers of acoustic receivers signals are connected to the inputs of a multi-channel analog-to-digital converter, the output of which is connected to the data bus of the microcontroller, the control outputs of which are via the control inputs are connected to the inputs of the digital-analog converter and the delta pulse generator of the first and second channels for generating the sounding signal, with the drive of the acoustic signal receivers and with the control input of the multi-channel analog-to-digital converter, and the modem input / output is connected to the control bus and to the data bus microcontroller and to the logging cable of the communication channel. The device allows; additionally obtain information on the resonant and anisotropic properties of rocks, their fracturing and cavernousness, increase the accuracy and reliability of the study by taking into account the error caused by the deviation of the depth probe from the well axis, increase the noise immunity due to the implementation of the principle of redundancy in data encoding, as well as the degree of adaptation of parameters acoustic signal depending on geological conditions.

Description

The utility model relates to geophysical instruments intended for the study of open-hole wells by the method of acoustic logging for the purpose of lithological separation of the section, determination of the physicomechanical and petrophysical properties of rocks, as well as the degree of their anisotropy, fracturing and cavernousness.

A device for acoustic research of wells, in particular for determining rock hardness and lithological separation of a section of a well based on an analysis of the characteristic resonant frequencies of the rocks, contains an acoustic oscillator connected to a linearly varying frequency generator, and an oscillation receiver connected via analog amplifiers to

a digital converter connected to a microcontroller, to the information input of which a storage unit for reference frequencies is connected, and its output is connected through an encoder to a telemetric communication system. (RU No. 49630, G 01 V 1/40, 2005).

The disadvantages of this device are the limited amount of useful information and the lack of the ability to visualize the received data, which increases the likelihood of errors in solving the problems.

Of the known devices, the closest to the proposed technical essence is an acoustic well logging device containing a ground and a borehole part (a deep probe), while the borehole part consists of an emitter connected in series with a program-controlled generator of a complex frequency-modulated sounding acoustic signal, according to at least one receiver, channel switch, attenuator, amplifier, controller, downhole telecom system connected via a geophysical cable TV system to the terrestrial communication, and the surface portion consists of a telemetry system communication, an amplifier, an analog-digital converter connected to the buffer memory and an acoustic coprocessor comprising a recording unit, a central processing unit and a control unit. (RU No. 2096812, G 01 V 1/40, 1996).

The known device provides registration of high-resolution wave patterns intended for the analysis of kinematic and dynamic parameters of all types of waves and allows you to comprehensively combine different methods of acoustic logging in order to obtain high-quality information throughout the well section in any geological conditions.

However, the known device does not provide information about the resonant properties of rocks, the degree of their anisotropy, fracture and cavernousness, and is also associated with

the need to use sophisticated ground equipment and transmitting information via cable in analog form, which impairs the noise immunity of the system. In addition, the use of a frequency-modulated signal generator in the device under consideration does not allow us to adequately solve the problem of adapting the parameters of the probing effect depending on geological conditions due to the limited set of signal spectra that can be obtained using such a device.

The basis of this utility model is the task of creating a device for acoustic research of wells, providing an extension of its functionality by obtaining information about the resonant and anisotropic properties of rocks, their fracturing and cavernousness, improving the accuracy and reliability of the study by taking into account the error due to deviation of the depth probe from the axis of the well, increasing noise immunity due to the implementation of the principle of redundancy in data encoding, as well as the degree of hell acoustic signal parameters depending on geological conditions.

The problem is solved in that the device for acoustic research of wells consists of a ground part, including a microcontroller with a modem, and connected to it through a communication channel of the well part, containing the first and second channels for generating a sounding signal, consisting, respectively, of series-connected digital an analog converter, a power amplifier and an emitter of acoustic waves with a wide radiation pattern, and from a series-connected pulse generator of short duration, the amplifier a power amplifier and an acoustic wave emitter with a narrow radiation pattern, at least two orthogonal pairs of acoustic signal receivers with amplifiers, a rotation drive for these receivers, a gyroscope, multi-channel analog-to-digital

a converter, a microcontroller, a modem and a power supply unit with a power bus, and the outputs of the gyroscope and amplifiers of the receivers of acoustic signals are connected to the inputs of the multi-channel analog-to-digital converter, the output of which is connected to the data bus of the microcontroller, the control outputs of which are connected to the inputs of the digital-to-analog converter through the control bus and a pulse generator of short duration of the first and second channels of the formation of the probing signal, with the drive of the receivers of acoustic signals and with control input channel of a multichannel analog-to-digital converter, and the modem input / output is connected to the control bus and to the data bus of the microcontroller and to the wireline cable of the communication channel.

The essence of the utility model is illustrated by drawings, in which Fig. 1 shows a block diagram of the proposed device, Fig. 2 shows a sketch of the borehole part (depth probe) indicating the main functional elements, and Fig. 3 shows a block diagram of the microcontroller operation algorithm.

The proposed device contains ground and borehole parts. The ground part of the device consists of a personal computer 1, which interprets the received data and controls the operation of the downhole part, as well as a modem 2, which provides information exchange between the ground and deep parts of the device.

The borehole part contains a pulse generator of short duration 3, which provides a signal having a wide range of components, a power amplifier 4 connected to it, the signal from which is fed to an acoustic wave emitter with a narrow radiation pattern 5. For implementing standard methods of acoustic logging, the device contains a probe generator based on a digital-to-analog converter 6 connected through a power amplifier 7 to a wide directional

acoustic waves emitter 8. Orthogonal pairs of receivers 9, 10 and 11, 12 remote at a certain distance from each other convert acoustic signals into electrical ones, which, after amplification by blocks 13, 14, 15 and 16, are fed to the inputs of a multi-channel analog-to-digital converter 17, the other input of which the signal output of the gyroscope is connected 18. The rotation of the receivers provides a drive 19 containing an integrated control circuit, the input of which is similar to the corresponding inputs / outputs of the modem 20, providing interaction with the ground clock connected to the data / control bus of the microcontroller 21. In the same way, the inputs of the probe signal generator 6 and the outputs of the multi-channel analog-to-digital converter 17 are connected to the data bus. All units of the downhole part of the device are powered from the power supply unit 22 directly connected to the geophysical logging cable .

The essence of the device is as follows.

In the process of research, the amplitude-frequency characteristic of the rock is obtained, based on the analysis of which the “characteristic" frequency of the rock is determined, which determines the hardness of its skeleton, which, in turn, is correlated with a number of mechanical and petrophysical properties of the rock: density, elasticity, porosity, etc. To do this, using a generator 3 and an emitter 5 creates a powerful pulse signal with a wide range of components. A narrow radiation pattern of the emitter 5 and the use of orthogonally arranged pairs of receivers 9-12 allow us to determine two characteristic frequencies of the rock, due to the peculiarities of its structure and, accordingly, the difference in the properties of the rock in space. The spectrum of the signal received by receivers 9-12, as well as the characteristics of the resonance curve calculated by the microcontroller 21, are transmitted to the surface. Based on the data obtained, the parameters of standard acoustic methods are adjusted in

In particular, the base frequency of the sounding action is set equal to the resonant frequency. Thus, frequency invariance is achieved in the analysis of the kinematic characteristics of the signal and the greatest sensitivity in determining its dynamic characteristics. In order to adjust the signal parameters, a generator 6 is used based on a digital-to-analog converter controlled by microcontroller 21. To implement standard acoustic logging methods, a separate emitter 8 with a wide radiation pattern is used, while synchronous continuous or stepwise rotation of pairs of receivers 9-12 is made to study differences in rock properties in different directions and the subsequent determination of the degree of its anisotropy, cavernousness and fracture. During measurements, they constantly monitor and record the position of the device in the well, as well as the current position of the receivers. With a significant deviation of the device from the axis of the well, appropriate amendments are made during the final analysis of the measurement results.

The device operates as follows.

The pulse generator 3 at the command of the microcontroller 21 generates a signal with a wide range of harmonics, which, after amplification, is fed to a narrowly directed emitter 5 of a dipole type that creates acoustic vibrations, which, after propagation through the rock, are converted by the orthogonal pairs of receivers 9, 10 and 11, 12 into the corresponding electric signal. At this stage of the study, acoustic vibration detectors are oriented in such a way that the first of each pair is located along the direction of wave propagation, and the second is respectively perpendicular to it. The received signals, which are damped harmonic oscillations, are amplified by blocks 13, 14, 15, 16 and are fed to the inputs of a multi-channel analog-digital

transducer 17. In the same way, a signal from the gyroscope 18 is received at its other input, allowing to take into account the deviation of the device from the axis of the well and, thus, to control its position in space. From the output of the converter, the signal is fed to the information bus of the microcontroller 21, which analyzes the received information, performs the necessary calculations and performs noise-resistant coding of data representing the spectra of the received signals, as well as their main parameters: frequency, quality factor, attenuation coefficient, etc. Based on the received information, the microcontroller 21 generates a probing effect of a certain shape and frequency, which is converted by a digital-to-analog converter 6 into an analog form and after rohozhdeniya through the power amplifier 7 is supplied to the emitter 8, which has a broad pattern. Two pairs of acoustic signal receivers 9, 10 and 11, 12, driven by the drive 19, convert the signal into electrical form, which, similarly to the case already considered, is again fed to the information input of the microcontroller 21, where the received information is processed and encoded. The implementation of the synchronous rotation of the signal receivers 9-12 allow continuous scanning of the wellbore and provide information about the anisotropic properties of the rock. The use of a digital-to-analog converter 6 as a sounding generator makes it possible to solve the problem of adapting the parameters of an acoustic signal depending on specific conditions and previously obtained information.

To ensure communication with the ground part, a modem 20 is used, connected to the information bus of the microcontroller on one side and a wireline cable on the other. The modem transmits encoded data to the surface and receives control information. For communication with the borehole part on the surface is installed

a similar modem 2 connected to a personal computer 1, which interprets the received information and controls the operation of the downhole part of the device. The software installed on computer 1 allows you to visually present information, including in the form of 3-dimensional graphs that reflect the structure of the well section and the quantitative characteristics of the rocks that form it.

Management and synchronization of the operation of all blocks of the downhole part of the device is performed by the microcontroller 21, the operation algorithm of which is shown in Fig.3. As a microcontroller, you can use Motorola's 68H916H5 chip.

Thus, the proposed device allows the registration of longitudinal and transverse waves to implement most of the known methods of acoustic logging, including analysis of the resonance characteristics of rocks in order to determine the hardness and the associated physical, mechanical and petrophysical properties of the latter. At the same time, the device also solves metrological problems associated with improving the quality of measurements by eliminating the causes of errors. Finally, the combined use of various methods of acoustic logging suggests the need to adjust the parameters of the probing signal, taking into account already received information. Thus, the proposed device solves a wide range of urgent problems, but at the same time, it is intended for sharing with other devices in the GIS complex.

Claims (1)

  1. A device for acoustic research of wells, consisting of a ground part, including a microcontroller with a modem, and connected to it through a communication channel of a well part, containing the first and second channels for generating a sounding signal, consisting, respectively, of a series-connected digital-to-analog converter, a power amplifier, and an acoustic emitter waves with a wide radiation pattern, and from a series-connected pulse generator of short duration, a power amplifier and an acoustic emitter waves with a narrow radiation pattern, at least two orthogonal pairs of acoustic signal receivers with amplifiers, a rotation drive of these receivers, a gyroscope, a multi-channel analog-to-digital converter, a microcontroller, a modem and a power supply unit with a power bus, the outputs of the gyroscope and amplifiers of acoustic signal receivers connected to the inputs of a multi-channel analog-to-digital converter, the output of which is connected to the data bus of the microcontroller, the control outputs of which through the control bus with They are connected to the inputs of the digital-to-analog converter and the short-duration pulse generator of the first and second channels for generating the probing signal, with the drive of the acoustic signal receivers and with the control input of the multi-channel analog-to-digital converter, and the modem input / output is connected to the control bus and to the data bus of the microcontroller and to the logging communication channel cable.
    Figure 00000001
RU2006124605/22U 2006-07-10 2006-07-10 Device for acoustic research of wells RU57360U1 (en)

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Cited By (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010019070A1 (en) * 2008-08-14 2010-02-18 Schlumberger Canada Limited Method and a system for monitoring a logging tool position in a borehole
RU2452980C2 (en) * 2007-05-21 2012-06-10 Шлюмбергер Текнолоджи Б.В. Methods and systems for processing acoustic wave signals
RU2462592C1 (en) * 2011-05-04 2012-09-27 Общество С Ограниченной Ответственностью "Энергодиагностика" Acoustic method of detection of fluid behind-casing flows location
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RU2640125C1 (en) * 2016-11-15 2017-12-26 Гостева Татьяна Викторовна Acoustic system of determining parameters of perforation at secondary opening of oil and gas drilling wells

Cited By (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2452980C2 (en) * 2007-05-21 2012-06-10 Шлюмбергер Текнолоджи Б.В. Methods and systems for processing acoustic wave signals
WO2010019070A1 (en) * 2008-08-14 2010-02-18 Schlumberger Canada Limited Method and a system for monitoring a logging tool position in a borehole
RU2462592C1 (en) * 2011-05-04 2012-09-27 Общество С Ограниченной Ответственностью "Энергодиагностика" Acoustic method of detection of fluid behind-casing flows location
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RU2640125C1 (en) * 2016-11-15 2017-12-26 Гостева Татьяна Викторовна Acoustic system of determining parameters of perforation at secondary opening of oil and gas drilling wells

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